End-burning KNO3/Sucrose or KNO3/Dextrose results in a Smoke-Bomb with zilch for thrust.

Try experimenting with room temperature mixed Epoxy Glue (instead of Sugar) for the fuel with KNO3.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !